Some problems with arch bridge assessment and potential solutions
The history of arch bridge assessment is outlined. In order to be economically viable, two dimensional analyses are conducted and a set of empirically derived rules are used to define the effects of the third dimension. The MEXE method, developed by Pippard, is commonly used. The limitations of the methods used for arch bridge assessment are considered with respect to field studies for a group of bridges that were suddenly subjected to much heavier traffic. The bridges were surveyed using a Total Station capable of measuring distance directly off the stonework. This showed the presence of a longitudinal crack between the bulk of the arch and the section under the spandrel wall. Deflection at the crown of the arch as a train passes over was examined. As the train approached the bridge, load on the embankment pushes the abutment forward and then load on the bridge caused downward deflection of the arch. The limitations of field tests conducted in 1985-1995 on assessment procedures for arch bridges are outlined. The potential for a model based on fan distribution in small bridges is considered. It is concluded that arches with a low dead load may be susceptible to traffic damage, although current assessment rules indicate that they are safe.
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/14665123
-
Authors:
- HARVEY, B
- Publication Date: 2006-2-16
Language
- English
Media Info
- Pagination: 45-50
-
Serial:
- Structural Engineer
- Volume: 84
- Issue Number: 3
- Publisher: Institution of Structural Engineers
- ISSN: 1466-5123
Subject/Index Terms
- TRT Terms: Arch bridges; Bearing capacity; Bridges; Design; Evaluation; Loads; Mathematical models
- ITRD Terms: 3427: Arch bridge; 3085: Bearing capacity; 3455: Bridge; 9011: Design (overall design); 9020: Evaluation (assessment); 5567: Load; 6473: Mathematical model
- Subject Areas: Bridges and other structures; Design; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 01030360
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Files: ITRD
- Created Date: Aug 7 2006 1:33PM